Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	(10.90%)	21.50%	(16.30%)	27.30%
Unrecognized tax benefits	$ 336		$ 336		$ 464
Change in unrecognized benefits			(128)
Unrecognized tax benefits with tax positions that would impact effective tax rate	286		286		410
Interest and penalties expense (benefit)			(36)	$ 15
Interest and penalties accrued	$ 49		49		$ 85
Cash paid for income taxes, net of refunds			$ 220	$ 72